[Intel-gfx] [PATCH] drm/i915/glk: ECS Liva Q2 needs GLK HDMI port timing quirk

[Jani Nikula]

On Thu, 25 Aug 2022, Ville Syrjälä <ville.syrjala at linux.intel.com> wrote:
> On Thu, Jun 16, 2022 at 03:41:37PM +0300, Jani Nikula wrote:
>> From: Diego Santa Cruz <Diego.SantaCruz at spinetix.com>
>> 
>> The quirk added in upstream commit 90c3e2198777 ("drm/i915/glk: Add
>> Quirk for GLK NUC HDMI port issues.") is also required on the ECS Liva
>> Q2.
>> 
>> Note: Would be nicer to figure out the extra delay required for the
>> retimer without quirks, however don't know how to check for that.
>> 
>> Cc: stable at vger.kernel.org
>> Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1326
>> Signed-off-by: Diego Santa Cruz <Diego.SantaCruz at spinetix.com>
>> Signed-off-by: Jani Nikula <jani.nikula at intel.com>
>
> Seems fine. Although I do wonder whether we could directly identify the
> bogus retimer chip via the dual mode adapter registers. I've asked for
> that in the bug.
>
> Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Thanks, pushed to drm-intel-next. Let's follow up with cleanups if the
folks in the bug ever reply.

BR,
Jani.

>
>> ---
>>  drivers/gpu/drm/i915/display/intel_quirks.c | 3 +++
>>  1 file changed, 3 insertions(+)
>> 
>> diff --git a/drivers/gpu/drm/i915/display/intel_quirks.c b/drivers/gpu/drm/i915/display/intel_quirks.c
>> index c8488f5ebd04..e415cd7c0b84 100644
>> --- a/drivers/gpu/drm/i915/display/intel_quirks.c
>> +++ b/drivers/gpu/drm/i915/display/intel_quirks.c
>> @@ -191,6 +191,9 @@ static struct intel_quirk intel_quirks[] = {
>>  	/* ASRock ITX*/
>>  	{ 0x3185, 0x1849, 0x2212, quirk_increase_ddi_disabled_time },
>>  	{ 0x3184, 0x1849, 0x2212, quirk_increase_ddi_disabled_time },
>> +	/* ECS Liva Q2 */
>> +	{ 0x3185, 0x1019, 0xa94d, quirk_increase_ddi_disabled_time },
>> +	{ 0x3184, 0x1019, 0xa94d, quirk_increase_ddi_disabled_time },
>>  };
>>  
>>  void intel_init_quirks(struct drm_i915_private *i915)
>> -- 
>> 2.30.2

-- 
Jani Nikula, Intel Open Source Graphics Center